Method of resurfacing rolls



Oct. 25, 1932. E. E. MOORE ET AL 1,884,104

METHOD OF RESURFACING ROLLS Filed Nov. 8. 1928 2 Sheets-Sheet l 1&1

Oct. 25, 1932. E. E. MOORE ET AL METHOD OF RESURFACING ROLLS Filed Nov. 8, 1928 2 Sheets-Sheet 2 Patented Oct. 25, 1932 UNITED STATES PATENT OFFICE EDWIN EARL MOORE, CHARLES L. MCGRANAHAN, AND CECIL WABRENDEE, OF GARY,

INDIANA, ASSIGNORS TO AMERICAN SHEET AND TIN PLATE COMPANY, A CORPORA- TION OF NEW JERSEY METHOD RESURFACING ROLLS Application filed November 8, 1928. Serial No. 318,094.

This invention relates to rolls and more particularly to resurfaced rolls and a method of resurfacing said rolls, and has for its object the provision of an improved roll struc- 6 ture and method of resurfacing whereby defects caused by spalling and the like may be removed.

Heretofore, when rolling .mill rolls have become badly worn or spalled it has general- 10ly been the practice to discard the entire roll,

although some attempts have been made to resurface the rolls by shrinking or keying a sleeve in position over the entire roll surface so as to present a new rolling face. The sleeves as heretofore applied over the entire roll surface were not satisfactory, due to heat expanding and loosening the sleeves.

The present invention provides for cutting away the spalled or otherwise damaged portion of the roll, then applying one or more relatively narrow sleeves or rings on the cutaway portion of the roll to replace the metal removed, and then turning down the rings to the same diameter as the original roll. By using the relatively narrow rings or sleeves the expansion is reduced and the sleeves can be more exactly machined and fit to the rolls so that they will remain fixed on the roll body.

In the drawings:

Figure l is a plan of a roll showing the spalled off or broken end portions.

Figure 2 is a similar view showing at the left end the first and at the right end the second steps of my reconditioning method.

Figure 3 is a plan View partly in section showing the completely reconditioned roll.

Figure 4 is a sectional plan view showing a modified form of the invention used to resurface or recondition the complete surface of a roll.

Referring more particularly to Figure 1 of the drawings, the numeral 2 designates a working roll such as used in a four-high strip mill and the numeral 3 designates the spalled portions of the roll where the chilled surface has broken away from the unchilled body portion.

In Figure 2 the roll 2 is shown with its end portions turned down, as at 4, to remove portion is provided with a buttress thread 5, as shown at the right-hand end of said figure. Suitable sleeves 6 are then machined to exactly fit on the turned down portions 4 and to have at least as great, and preferably a slightly greater, outer diameter than the original r011 body. These are internally threaded with a buttress thread 7 and are then screwed home on the turned down and threaded ends 4; of the roll. After the sleeves 6 are screwed home on the ends 4, the roll will be machined either by turning or grinding to even up the surface and the roll is then polished to provide a true polished working surface.

- Referring to the modified form of Figure 4 a backing-up roll 8 is shown provided with threaded end rings or sleeves 9 which are adapted to be screwed home against the sleeves 9 and to lock said sleeves 9 in position.

The steps followed in preparing the roll, mounting the sleeves and finishing the roll are the same as those described for the working roll 2.

Rolls resurfaced as above will have a new life even greater than the life of the original roll due to the fact that the sleeves forming the new surface may be formed of a materially higher grade of metal than rolls and,

therefore, said sleeves will not spall or break.

While we have described and shown certain specific examples of our invention as embodied in rolls, it will be "understood that we do not wish to be limited thereto, since various modifications may be made without departing from the scope thereof, as defined in the appended claims.

We claim:

1. The method of resurfacing one-piece solid rolling mill'metal working rolls which have had their end portions destroyed by chipping and spalling, which consists in turning down the roll body from the end inwardly to a point beyond the portion destroyed and sufiiciently deep to entirely remove the defect, leaving the undamaged portion or said roll intact, then machining a ring to a size so that its internal diameter will fitsaid turned down portion of said roll and its outer diameter will be slightly greater than the diameter of the undamaged portion of said roll, threading said turned down portion of said roll and the internal surface of said ring, screwing said ring home on said threaded portions of said roll, and finally cutting down and polishing the surface'of said original roll body and said ring to form an even polished surface.

2. The method of resurfacing one-piece rolling mill rolls which have spalled or chip ed, which, consists in turning down the roll hody to remove the defective portions, then machiningrings to a size so that their internal diameter will fit the turned down portion of said roll and their outer diameter will be slightly greater than the original diameter of the roll, threading at least-a part of said turned down portion of said roll and the internal surface of said rings, screwin said rings home on said threaded portions 0 said roll and finally cutting down and polishing the surface of said roll to an even polished surface.

In testimony whereof, we have hereunto set our hands.

EDWIN EARL MOORE. CHARLES L. MCGRANAHAN. CECIL WARRENDER. 

